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https://issues.apache.org/jira/browse/LUCENE-4828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13603008#comment-13603008
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Yonik Seeley commented on LUCENE-4828:
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bq. > For highlighting, I've heard it argued both ways (i.e. prohibited terms
can be important too).
bq. Hmm can you give an example where it's useful to highlight the prohibited
terms?
It wasn't my argument, but I guess it was along the lines that there can be
info/relevance in the fact that the user did not want documents with a specific
term, and thus it can make sense to highlight them (maybe with a diff color...)
bq. > I wasn't thinking about highlighting as much as something like
distributed IDF or other global term statistics.
bq. But, normally, prohibited clauses don't contribute to scoring so the stats
of terms inside them don't need to be distributed?
The key word there is "normally". As I said, it depends on the type of query
in the prohibited clause, and the boolean query does not have the knowledge to
know if it will matter or not. Something other than extractTerms could be used
for distributed term stats though.
> BooleanQuery.extractTerms should not recurse into MUST_NOT clauses
> ------------------------------------------------------------------
>
> Key: LUCENE-4828
> URL: https://issues.apache.org/jira/browse/LUCENE-4828
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/search
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 5.0, 4.3
>
> Attachments: LUCENE-4828.patch
>
>
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